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J/ApJ/788/45   Luminosity and redshift of galaxies from WISE/SDSS  (Toba+, 2014)

Luminosity and redshift dependence of the covering factor of active galactic nuclei viewed with WISE and Sloan Digital Sky Survey. Toba Y., Oyabu S., Matsuhara H., Malkan M.A., Gandhi P., Nakagawa T., Isobe N., Shirahata M., Oi N., Ohyama Y., Takita S., Yamauchi C., Yano K. <Astrophys. J., 788, 45 (2014)> =2014ApJ...788...45T (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; Galaxies, IR ; Photometry, infrared ; Redshifts Keywords: catalogs - galaxies: active - galaxies: luminosity function, mass function - galaxies: nuclei - infrared: galaxies - methods: statistical Abstract: In this work, we investigate the dependence of the covering factor (CF) of active galactic nuclei (AGNs) on the mid-infrared (MIR) luminosity and the redshift. We constructed 12 and 22 µm luminosity functions (LFs) at 0.006≤z≤0.3 using Wide-field Infrared Survey Explorer (WISE) data. Combining the WISE catalog (Cat. II/311) with Sloan Digital Sky Survey (SDSS, Cat. II/294) spectroscopic data, we selected 223982 galaxies at 12 µm and 25721 galaxies at 22 µm for spectroscopic classification. We then identified 16355 AGNs at 12 µm and 4683 AGNs at 22 µm by their optical emission lines and cataloged classifications in the SDSS. Following that, we estimated the CF as the fraction of Type 2 AGN in all AGNs whose MIR emissions are dominated by the active nucleus (not their host galaxies) based on their MIR colors. We found that the CF decreased with increasing MIR luminosity, regardless of the choice of Type 2 AGN classification criteria, and the CF did not change significantly with redshift for z≤0.2. Furthermore, we carried out various tests to determine the influence of selection bias and confirmed that similar dependences exist, even when taking these uncertainties into account. The luminosity dependence of the CF can be explained by the receding torus model, but the "modified" receding torus model gives a slightly better fit, as suggested by Simpson. Description: We selected 12 and 22 um flux-limited galaxies based on the WISE (Cat. II/311) and SDSS (Cat. II/294) catalogs, and these galaxies were then classified into five types according to their optical spectroscopic information in the SDSS catalog. For spectroscopically classified galaxies, we constructed the luminosity functions using the 1/Vmax method, considering the detection limit of the WISE and SDSS catalogs. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 122 224168 List of the 224168 selected galaxies
See also: II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009) II/311 : WISE All-Sky Data Release (Cutri+ 2012) J/ApJ/697/506 : Mid-infrared galaxy luminosity function from AGN (Dai+, 2009) J/ApJ/743/34 : WISE and SDSS-DR7 data in 69 galaxy clusters (Chung+, 2011) J/other/RMxAA/47.361 : AGN activity in isolated SDSS galaxies (Coziol+, 2011) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 30 A30 --- Name Object identifier (1) 32- 33 I2 h RAh Hour of Right Ascension (J2000) 35- 36 I2 min RAm Minute of Right Ascension (J2000) 38- 42 F5.2 s RAs Second of Right Ascension (J2000) 44 A1 --- DE- Sign of the Declination (J2000) 45- 46 I2 deg DEd Degree of Declination (J2000) 48- 49 I2 arcmin DEm Arcminute of Declination (J2000) 51- 54 F4.1 arcsec DEs Arcsecond of Declination (J2000) 56- 62 F7.2 mJy F12 WISE 12 micron band flux density 64- 70 F7.2 mJy F22 ? WISE 22 micron band flux density 72- 76 F5.3 --- z Redshift 78- 86 A9 --- Type Source type 88- 90 F3.1 --- w3sat WISE 12 micron band saturated pixel fraction 92- 94 F3.1 --- w4sat ? WISE 22 micron band saturated pixel fraction 96-101 F6.2 --- SN12 Signal-to-Noise ratio in 12 micron band 103-108 F6.2 --- SN22 ? Signal-to-Noise ratio in 22 micron band 110-115 F6.1 --- w3ccmap WISE 12 micron band contamination flag (2) 117-122 F6.1 --- w4ccmap WISE 22 micron band contamination flag (2)
Note (1): There are 223982 galaxies at 12 microns defined by F12≥9.0 mJy, w3sat=0.0, w3ccmap=0.0, and an SN12≥10. There are 25721 galaxies at 22 microns with F22≥0.9 mJy, w4sat=0.0, w4ccmap=0.0, and an SN22≥10. Note (2): Contaminated or biased due to proximity to an image artifact (e.g., diffraction spikes, scattered-light halos, or optical ghosts). 0 value means unaffected.
History: From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 05-Jul-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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